Carbureter.



D. COLL;

CARBURETER.

APPLICATION HLED MAY 7. 1913.

1,235,]. 88 Patented July 31, 1917.

2 SHEETS-SHEET l- D. COLE.

CARBURETER.

APPLICATION FILED MAY]. 19x3.

1 ,235, 1 88, Patented Jul 31, 1917.

2 SHEETS-SHEET 2.

Z 1 572647565 R 2/672 Z07 UNITED STATES PATENT OFFICE.

DON COLE, OF CHICAGO, ILLINOIS, ASSIGNOR TO STROMBERG MOTOR DEVICES COM- PANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

CARBURETER.

Specification of Letters Patent.

Application filed May 7, 1913. Serial No. 766,001.

T 0 all whom it may concern:

Be it known that I, DON COLE, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented a certain new and useful Improvement in Carbureters, of which the followingis a full, clear, concise, and exact description, reference being had to the accompanying drawings, forming a part of this specification:

My invention relates to carbureters for internal combustion engines, and is concerned with certain improvements which go to make up an eflicient and durable device of this class.

It is quite common nowadays to provide a carbureter with an auxiliary air inlet which is brought into play at the higher engine speeds. It is desirable, of course, to have the auxiliary air inlet controlled by a suitable valve which is opened more and more by the engine suction as the higher engine speeds are attained. In the past ordinary puppet valves have commonly been employed to control the auxiliary air inlets, but this type of valve, when employed in this connection, is subject to serious objection because of the inevitable fluttering of the same. One of the objects of the present invention is to provide a valve controlling the auxiliary air supply, which valve is properly responsive to engine suction but will not flutter. With this object in view, I provide my carbureter with two oppd sitely-disposed air inlets of different diameters and a double-seated valve normally closing said air inlets. Resilient means, preferably in the form of a coiled spring, is provided for normally retaining said doubleseated valve in closed po tion. I have found that when this valve is employed for controlling the auxiliary air supply, the position of said valve will not be affected by the engine suction until the force exerted by the atmosphereupon that portion of the valve which normally closes the auxiliary air inlet of greater diameter is suflicient to overcome the force exerted by the atmos" phere upon that portion of the valve which normally closes the auxiliary air inlet of smaller diameter, and the force exerted upon the valve by the spring which normally holds the same seated. I have found that the double-seated valve mentioned responds properly to the varying demands of the en gine without fluttering.

As is quite commonly known, it is desirable that the starting mixture for an internal combustion engine be very rich as compared with the quality of combustible mixture supplied to the engine after the same has started. I secure this rich starting mixture by providing my carbureter with means for manually restricting the main air inlet when the engine is started, at the same time automatically increasing the pressure tending to hold the auxiliary air inlet valve closed.

My invention is set forth in detail in the following description and is illustrated in the accompanying drawings in which:

Figure 1 is a view illustrating the carbureter of my invention partly in axial section and partly in side elevation;

Fig. 2 is an end view of the same, and

Fig. 8 is a perspective-sectional view illustrating the pin-and-cam-slot arrangement whereby the auxiliary air inlet valve is locked in closed position when the main air inlet is restricted to secure the starting mixture.

Similar reference numerals refer to similar parts throughout the several views.

The carbureter of my invention comprises a casing at, which casing is provided at its upper end with an annular flange 5, provided with suitable apertures whereby the carbureter may be secured in operative re lation with the intake manifold of an internal combustion engine. Controlling the admission of combustible mixture to the intake manifold of the engine is the usual pivoted butterfly valve or throttle illustrated at 6. The casing at is provided with a pair of inner annular shoulders 7 and 8 which support a Venturi tube 9.,as shown. The Venturi tube has threaded engagement with the shoulde-r 7, and is provided with a suitable fiange, which rests upon a corresponding flange withwhich the shoulder 8 is provided. The Venturi tube 9 when in operative position forms an annular chamber 10 between the shoulders 7 and 8. which chamber has communication with the atmosphere through a suitable port 11 in the side of the casing 4.

At its lower end the carbureter casing 4 is provided with a transverse bore 12, which is intercepted by vertical bores 13 and 14, as shown. The vertical bore 13 extends through co-axial bosses 15 and 16, as shown. Threaded into the boss 15 is a suitable fuel nozzle 17 which projects slightly into the Yenturi tube 9. The boss 16 is provided at its lower end with a drain plug 18, which effectually seals the lower end of the bore 13. The bore 12. at one end thereof, has communicating with a suitable float chamber of any type desired, the other end of said bore being closed by means of a suitable plug. as shown. The lower end of the vertical bore ll is likewise closed by a suitable plug. Disposed in the vertical bore 1% and threaded into position is a fuel nozzle 19 provided with an aperture 20 communicating with the annular chamber 10 which is open to the atmosphere. The aperture 20 being above the normal fuel level in the nozzle 19, prevents the nozzle 19 from coming into play at low engine speeds.

Held in position by means of a nut 21 threaded upon the boss 16 is a horn 22, which constitutes the inlet for the main supply of air. This horn or main air inlet is provided with a throttle in the form of a butterfly valve 23, which valve is, however, provided with apertures 24. It will be readily seen, therefore, that this butterfly valve, even when in closed position merely serves to restrict the main air inlet.

The casing l is provided with an offset portion 25 disposed directly over the horn 22. which offset portion may be said to constitute the auxiliary air inlet chamber. This auxiliary air inlet chamber is provided with oppositely-located inlet openings 26 and 27. It will be noted that the inlet opening 26 is of greater diameter than the opposite inlet opening 27. The opening 26 is provided with a spider 26* provided with an annular shoulder. which serves as one seat for a double-seated valve which comprises a closure '28 for the opening 26 and a closure 29 for the opening 27, the said closures being integral with a connecting sleeve 30, as shown. Threaded within the sleeve 30 is a tube 30 within which is disposed a guiding rod 31 supported by the spider 26 The offset portion 25 is provided with downwardly-extendiiig arms 32 which at their lower end are provided with a sleeve 33 concentric with the double-seated valve and the axis of the butterfly valve constituting the throttle for the main air inlet.

The shaft upon which the valve 23 controlling the main air supply is mounted is provided with-an operating lever arm 34,

which lever arm is held against rotation independently of the valve 23 and its shaft, but is adapted to move longitudinally of the axes thereof. The connection between the sleeve of the operating lever and the shaft of the valve 23 is preferably in the form of a pin and slot, as shown in Fig. 1.

Secured in the sleeve of the operating lever 3i is a hollow member provided with cam slots 36. in which rides a pin 37 carried by the sleeve 33. The hollow member 35 is provided with a reduced portion at its upper end. upon which reduced portion is threaded a member 38, provided with ball deteiits adapted to engage longitudinal slots in said reduced portion to retain the member 38 at any desired position relative thereto. The member 38 is provided with an upper reduced portion. as shown. Disposed around the upper portion of the member 38 is a coiled spring 39, which bears against the double-seated valve and is disposed around the lower portion of the tube 30. It will readily be seen that the tension of the spring 39 may be readily adjustedby means of the member 38, which is preferably knurled, as shown.

lVhen the engine with which my carbureter is associated is to be started, the lever arm 3i is operated to move the throttle 23 to closed position to restrict the main air inlet opening. As the lever arm is swung to restrict the main air inlet the lever arm and hollow member 35 are raised, due to the presence of the pin 37 in the cam slots 36, thus compressing the spring 39 and holding the double-seated valve controlling .the auxiliary air supply in closed position.

After the engine is started and the valve 23 in the main air inlet has been opened, the supply of air being greater, the mixture passing up through the Ventu'ri tube is, of course, leaner. As the engine speed becomes greater and greater the auxiliary fuel nozzle 19 is brought into play and the double-seated valve opened to agreater or less extent, the posit-ion of the double-seated valve varying, of course, with the suction within the auxiliary air inlet chamber. The double-seated valve 30 responds properly to the demands of the internal combustion engine without fluttering. I have found that. during the operation of the carbureter, should the double-seated valve be manually displaced from proper position and released, it will at once assume its proper position without fluttering or faltering in any Way.

While I have shown. my doubleseated valve as controlling the auxiliary air supply, it should be borne in mind that this valve may, if desired, be employed for controlling the main air supply of a carbureter. While I have illustrated my invention in the particular embodiment herein described, I do not wish to be limited to this particular construction, but wish to claim any modifications of my invention which may suggest themselves to those skilled in the art.

\Vhat I claim and desire to secure by Letters Patent of the United States is:

1. A carbureter comprising a casing, fuelsupply means feeding into said casing 21. pair of oppositely located air inlets of different size in said casing, each independently open to the outside atmosphere, a respectively double-seated puppet valve for normally closing said air inlets, and a spring tending to hold said valve in seated position. 7

2. A carbureter comprising a casing, fuelsupply means feeding into said casing a pair of air inlets of different size in said casing, each independently open to the outside atmosphere, and a puppet valve comprising respective connected closures for said inlets corresponding in size to their respective air inlets.

3. A carbureter comprising a casing, fuelsupply means feeding into said casing a pair of air inlets of different size in said casing, each independently open to the outside atmosphere, and a respectively double-seated puppet valve normally closing said openings.

l. A carbureter comprising a casing, a fuel inlet, a main air inlet, an auxiliary source of air supply comprisin a pair of oppositely located air inlets of different size, each independently open to the outside atmosphere, and a respectively double-seated suctionoperated puppet valve normally closing said inlets.

5. A ca rbureter comprising a casing, a fuel inlet, a main air inlet, an auxiliary source of air supply comprising apair of oppositely located air inlets of different size, each independently open to the outside atmosphere, a respectively doubleseated puppet valve normally closing said inlets, and a spring tending to hold said valve in seated position.

(3. A carbureter comprising a casing, a fuel inlet, a main air inlet, an auxiliary source of air supply comprising a pair of air inlet openings of different size, each independently open to the outside atmosphere and connected respective suction-operated closures for said inlet openings.

7. A carbureter comprising a casing. a fuel inlet, a main air inlet, an auxiliary source of air supply comprising a pair of air in let openings of different size, each independently open to the outside atmosphere connected respective suction-operated closures for said inlet openings, and a spring tending to hold said closures in seated position.

S. A carbureter comprising a fuel inlet, a main air inlet, an auxiliary air inlet, a valve for said auxiliary air inlet, in combination with means for restricting said main air inlet and holding said auxiliary air inlet Valve in closed position, said means comprising a throttle in said main air inlet and a member operatively connected with said auxiliary air inlet valve provided with a cam slot, a pin supported by the casing riding in said slot, and means for simultaneously rotating said member and throttle upon their axes.

9. A carbureter comprising a casing, a main air inlet, an auxiliary air inlet, a valve for said auxiliary air inlet, in combination with means for restricting said main air inlet and holding said auxiliary air inlet valve in closed position, said means comprising a throttle in said main air inlet, a lever for rotating said throttle, amember operatively connected to said auxiliary air inlet valve capable of longitudinal movement independently of said throttle and held against rota- .tion independently of said throttle, and a pin-and-slot connection between said member and casing, whereby said member is moved to hold the auxiliary air inlet valve closed when said lever is operated to restrict the main air inlet.

10. A carbureter comprising a casing, a main air inlet, an auxiliary air inlet, a valve for said auxiliary air inlet, in combination with means for restricting said main air inlet and holding said auxiliary air inlet in closed position, said means comprising a throttle in said main air inlet, a lever for rotating said throttle, a member capable of longitudinal movement independently of said throttle but held against rotation independently of the same, a spring interposed between said member and said auxiliary air inlet valve, and a pin-and-slot connection between said member and the casing whereby said member is moved to hold the auxiliary air inlet valve closed when said lever is operated to restrict the main air inlet.

11. A carbureter comprising a casing, fuel supply means feeding into said casing, a main air inlet, auxiliary air inlets, said auxiliary air inlets being of different size, a puppet valve comprising respective connected closures for said auxiliary air inlets corresponding in size to their respective air inlets, and resilient means tending to hold said valve in its seating position on the lower engine suctions and being automatically overcome by the higher engine suctions to allow the valve to open.

In witness whereof, I hereunto subscribe my name this fifth'day of May A. D., 1913.

DON COLE.

\Vitnesses A. G. MCCALEB, ROBERT F. BRAGKE.

copies of this patent may be obtained for five cents each, by addressing the commissioner of Patents, Washiagten, E. ii. 

